Biar Aqueduct
The Biar Aqueduct, or Wadi el-Biyar Aqueduct, is an ancient aqueduct in the northern Hebron Hills, south of Jerusalem, that formed part of the city's historic water-supply system. Traditional attribution places its construction under Herod the Great, but radiocarbon dating of its plasters indicates a mid-first-century CE build with second-century renovations associated with Aelia Capitolina, although it is possible that the entire system
dates exclusively to the second century. The two-stage option might place its construction under the governorship of Pontius Pilate. Sections were refurbished under the British Mandate in 1924 and remained in service until 1967.
History
The Biar Aqueduct includes a 2.8 km tunnel with vertical shafts approximately every 40 meters, as well as open channels. It operated intermittently from the Second Temple period until the 20th century and was finally decommissioned in 1967. Its water sources included the Biar Spring, Arrub Springs, and others near Solomon's Pools.Parts of the Biar aqueduct system were refurbished by the British during the Mandate period—most notably around 1924—enabling water from Solomon's Pools to continue supplying Jerusalem's Old City until approximately 1967. Additionally, records indicate that under the Mandate the Arrub aqueduct was decommissioned and replaced by a modern iron pipeline.